In the artwork, Nava is sitting and talking to Rubilax about sad topics. Over time, she has found a good conversational partner in him. He listens well and keeps the conversation going, but he doesn’t offer false moral like others. He doesn’t really “” at all—he only gives advice. That’s the point—Rubilax has lived for over two thousand years and knows well how life should be lived.
Crying near him isn’t a good idea—he hates tears because he doesn’t understand them. Nava knows this and constantly restrains herself, just to keep him from getting angry and leaving.
In short, thanks to Rubilax, Nava distracts herself from bad thoughts and doesn’t sit alone when Baku is at work.